Three of the 18 James Webb Space Telescope mirror segments were mounted on a test stand July 30 at the X-ray & Cryogenic Facility at NASAs Marshall Space Flight Center in Huntsville, Ala. The mirror segments are being moved into the facilitys cryogenic vacuum chamber, which will chill them to minus 414 degrees Fahrenheit to ensure they can withstand the extreme temperatures of space. As this cooling takes place, engineers and technicians from NASA and Ball Aerospace & Technologies Corp. of Boulder, Colo., will measure in extreme detail how the shapes of the mirrors change, simulating how they'll react to temperature changes in space.

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